苏通大桥北引桥桥墩冲刷防护方案研究

Study on Local Scouring Protection Scheme Around the North Approach Bridge Pier of Sutong Bridge

自苏通大桥建成通车以来,受局部水流流速、流态改变和桥区北岸围垦工程的影响,北侧桥墩附近河床冲刷严重,急需实施冲刷防护工程。根据冲刷防护工程的特点,通过对比分析,选取了抛石防护作为苏通大桥北引桥桥墩的冲刷防护措施,结合先导性物理模型试验结果、桥墩附近冲刷坑形状及紊流形态,综合确定冲刷防护工程范围,抛石防护结构采用上、下两层结构,下层为反滤层,上层为抛石护面,根据相关规范公式,计算确定了块石的稳定重量,研究成果可为类似桥墩基础防护提供参考。

Since the opening of Sutong Bridge, the erosion of the riverbed near the north side pier is serious because of the local flow velocity, flow pattern and the influence of the reclamation project on the northern bank of the bridge area. So the scour protection project is urgently needed. According to the characteristics of scour protection project, the riprap protection was taken as the scour protection measure of the north approach bridge pier of the Sutong Bridge through the comparison and analysis. The range of scour protection project is determined by comprehensive analysis of the results of the pilot physical model and the shape of scour hole and turbulent flow pattern around the pier. The riprap protection structure adopts two layers, the lower layer is the inverted filter and the upper layer is the riprap protective facing. The stable weight of the rock block is calculated by the design formulas. The study results may provide reference for similar pier scour protection project.